<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>第一个网页</title>
</head>
<body>
    <h1>hello world</h1>
    <button style="font-weight: bold;background-color: pink;" onclick="alert('你完了')">点我一下</button>
    <img src="http://gips3.baidu.com/it/u=4283915297,3700662292&fm=3028&app=3028&f=JPEG&fmt=auto?w=1440&h=2560" alt="星河">
</body>
</html>